There was a smallish apple producer (the fruit) that used a red apple with a bite taken out that lost the right to their logo. More recently there was another recipee startup with a pear logo that apple sued
At least Google had the decency to invent a word (itself a derivative of a word invented by a child).
In the UK the cloud IaaS vendor Skyscape was forced to change name by a certain media company for only part of their name, in an unrelated field.
How about if you want to protect a trademark you don't use a word with real world meaning? What benefit does it give society to give these protections to extant words?
Wouldn't be so bad if Sky had contributed anything useful to the world in the last twenty years.